My car wont start, it will run on carb cleaner sprayed into the intake manifold.

 

When connecting a pressure gauge to the HPFP schrader valve, I'm only getting around 6-8PSI reading after 20/30 seconds of cranking.

 

The HPFP cam lobe is brand new and the camshaft it runs on looks perfect.

 

Can the HPFP's fail to the point where they produce virtually no pressure?

Has anyone else encountered this before?

 

I believe the pressure reading at the HPFP schrader valve should be around 90PSI?

 

Any tips would be greatly appreciated

Does the HPFP need to be primed before becoming functional?

7 minutes ago, MikeTheThinker said:

Does the HPFP need to be primed before becoming functional?

 

Quite possibly!

 

What's the procedure for that?

4 minutes ago, RussB44 said:

 

Quite possibly!

 

What's the procedure for that?

Sorry, can't help with that.  My comment was based on general experience with pumps as they normally need to be able to create an hydraulic seal in order to pump.

 

A quick Google[tm] search for help on this brought up:

 

"Risk of damage to the high pressure pump through running dry

If the high pressure pump is removed or replaced, the initial fuel filling of the high pressure pump must be carried out before the first engine start. For this purpose, connect the vehicle diagnosis, measurement and information system -VAS 505x- and carry out the targeted function „bleeding the fuel system“. During this function, the fuel pump is actuated for 180 seconds."   https://workshop-manuals.com/skoda/octavia-mk2/power_unit/1.6/55;_66;_77_kw_tdi_cr_engine/fuel_preparation_system_diesel_injection/fuel_system_engine_side/removing_and_installing_the_high_pressure_pump/   https://workshop-manuals.com/skoda/octavia-mk2/power_unit/2.0/81;_103;_125_kw_tdi_cr_engine_(2nd_generation)/fuel_preparation_system_diesel_injection/fuel_system_engine_side/high_pressure_pump_summary_of_components/